Developing Scientific knowledge
Fill in each blank with the word that best completes the statement
Scientists develop knowledge by making
about the natural world that may lead to a
scientific question
A scientific question may lead to an)
which can be tested
The results of
can lead to changes in scientific knowledge.

Answer: hydrogen and oxygen

Explanation:

Answer:

Q) How many Carbon atoms are shown in the reactants

Ans) The reactants have one carbon atom

Q) How many C atoms are shown in the products?

Ans) there is one atom on the product side

Answer:

A

Explanation:

It has the lowest ionisation energy

Answer:

Beryllium

Explanation:

Explanation:

magnetization

coz it will still have two pols that is north and south pole

Answer:

28.23 g NH₃

Explanation:

The balanced chemical equation is:

N₂(g) + 3 H₂(g) → 2 NH₃(g)

Thus, 1 mol of N₂ reacts with 2 moles of H₂ to produce 2 moles of NH₃. We convert the moles to mass (in grams) by using the molecular weight (MW) of each compound:

MW(N₂) = 2 x 14 g/mol = 28 g/mol

mass N₂= 1 mol x 28 g/mol = 28 g

MW(H₂) = 2 x 1 g/mol = 2 g/mol

mass H₂ = 3 mol x 2 g/mol = 6 g

MW(NH₃) = 14 g/mol + (3 x 1 g/mol) = 17 g/mol

mass NH₃= 2 moles x 17 g/mol = 34 g

Now, we have to figure out which is the limiting reactant. For this, we know that the stoichiometric ratio is 28 g N₂/6 g H₂. If we have 36.85 g of H₂, we need the following mass of N₂:

36.85 g H₂ x 28 g N₂/6 g H₂ = 171.97 g N₂

We have 23.15 g N₂ and we need 171.97 g. So, we have lesser N₂ than we need. Thus, the limiting reactant is N₂.

Now, we calculate the product (NH₃) by using the stoichiometric ratio 34 g NH₃/28 g N₂, with the mass of N₂ we have:

23.25 g N₂ x 34 g NH₃/28 g N₂ = 28.23 g NH₃

Therefore, the maximum amount of NH₃ that can be produced is 28.23 grams.

1) single replacement

2) Zn + 2HCl -----> ZnCl + H

equation is already balanced

Answer:

Organelles; role.

Explanation:

A cell can be defined as the structural, fundamental, biological and functional unit of life. Cells are found in all living organisms because they are the basic unit of life. A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells. Generally, cells have the ability to independently replicate themselves. In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles. Some examples of cell organelles with their respective functions in all living organisms such as trees, birds, and bacteria include;

1. Nucleus : it controls all the activities taking place in the cell and the synthesis of proteins.

2. Mitochondria : it provides all the energy required in the cell by transforming energy forms.

3. Lysosomes : they are responsible for absorbing materials and breaking the materials taken in by the cells.

4. Chromosomes : they give sets of instructions for the synthesis of products.

5. Ribosomes : they are involved in the build up of proteins.

6. Endoplasmic Reticulum : this is where the ribosomes perform their tasks.

7. Cytoskeleton : they help to maintain and support the shape of the cells.

8. Vesicles : they ensure proteins are properly transported to the right and exact location.

9. Golgi apparatus : it prepares the protein for export by chemically tagging them.

10. Cell membrane : is the wall of the cell and typically controls what leaves and enters the cell.

Hence, cells are made of many parts, or organelles, that help the cell do its job. Each cell organelle has a specific function, or role.

Answer:

phylogenic trees/phylogeny

Explanation:

the evolutionary history and relationship of an organism or group of organisms is called its phylogeny

Answer:

H2 would have a coefficient of 2.

Explanation:

According to the balanced chemical equation, the coefficient of hydrogen is 4.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

Learn more about chemical equation,here:

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Answer:

True

Explanation:

It means the reaction is occuring.

Answer:

The empirical and molecular formula because the ratio is 2:1 and there is 2 hydrogen atoms and 1 oxygen atom.

Hope this helps!

Answer:

Gold is element 79 and its symbol is Au.

Answer:

1 mol

Explanation:

Using the general gas law equation as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

According to the provided information in the question;

V = 22.4L

T = 273K

P = 1 atm

R = 0.0821 Latm/molK

n = ?

Using PV = nRT

n = PV/RT

n = (1 × 22.4) ÷ (0.0821 × 273)

n = 22.4 ÷ 22.4

n = 1mol

Answer:

PCl3

Explanation:

The molecular formular of a compound shows the exact number of atoms of elements present in the compound. In this illustration, there is one atom of P and 3 atoms of Cl.

The formular is given as; PCl3

Answer:

PCl³

Explanation:

because there are 1 phosphorus atom and 2 chlorine atom.

Answer:

Explanation:

Polar side chains tend to be present on the surface of a protein where they can interact with the aqueous environment found in cells. On the other hand, non-polar amino acids tend to reside within the center of the protein where they can interact with similar non-polar neighbors.

Answer:

Id want to know how the nucleus looks like upclose, is it really that neutrons and protons are bond together, or are they just sticking in together. I'd also wanna look at electrons, or even possible hold them so that i can see the mass it really has

Explanation:

Answer:

Is this a general question or is there supposed to be a picture

Explanation:

Answer:

The physical properties of a solution are different from those of the pure solvent. ... Colligative properties are those physical properties of solutions of nonvolatile solutes that depend only on the number of particles present in a given amount of solution, not on the nature of those particles.

Learn more:

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Answer:

²³⁸₉₂U has 146 neutrons

Explanation:

To know which option is correct, we shall determine the number of neutrons in each case. This can be obtained as follow:

For ²⁴₁₂Mg:

Mass number (A) = 24

Proton number (P) = 12

Neutron number (N) =?

A = P + N

24 = 12 + N

Collect like terms

N = 24 – 12

N = 12

Thus, there are 12 neutrons in ²⁴₁₂Mg

For ⁷⁵₃₃As:

Mass number (A) = 75

Proton number (P) = 33

Neutron number (N) =?

A = P + N

75 = 33 + N

Collect like terms

N = 75 – 33

N = 42

Thus, there are 42 neutrons in ⁷⁵₃₃As

For ¹⁹₉F:

Mass number (A) = 19

Proton number (P) = 9

Neutron number (N) =?

A = P + N

19 = 9 + N

Collect like terms

N = 19 – 9

N = 10

Thus, there are 10 neutrons in ¹⁹₉F.

For ²³⁸₉₂U:

Mass number (A) = 238

Proton number (P) = 92

Neutron number (N) =?

A = P + N

238 = 92 + N

Collect like terms

N = 238 – 92

N = 146

Thus, there are 146 neutrons in ²³⁸₉₂U

Considering the options and the illustration made above, Only ²³⁸₉₂U has the correct number of neutrons written along side.

Answer:

propylcyclopentane

Explanation:

The rest Are swiggly lines and more than 5 sides

The organic compounds which consist of single bonded carbon and hydrogen atoms are called alkanes. They are also called the saturated hydrocarbons. Here the given alkane is propylcyclopentane. The correct option is A.

The propylcyclopentane is an alkane which is the simplest family of hydrocarbons. It is a cyclic hydrocarbon which acts as the major component of gasoline and it is also used in the manufacture of synthetic resins and rubber adhesives.

The propylcyclopentane is an important cycloalkane which contains five carbon atoms bonded to two hydrogen atoms above and below the plane. It appears as a clear colourless liquid with a petroleum like odor. It is less dense than water and it is insoluble in water.

Propylcyclopentane is a member of cyclopentanes, a cycloalkane and a volatile organic compound. Its molecular formula is C₈H₁₆. It can also be called as 1 - Cyclopentylpropane.

Thus the correct option is A.

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Answer:

answer below:

Explanation:

1) 4 Al + 3 O2 --> 2Al2O3.

2) Al mol= 28/27 = 1.037mol

O mol= 45/16 = 2.812mol

Al : O

4 : 2

x : 2.812

cross multiply

4 x 2.812/2  = 5.624 mol of Al

Al is limiting reactant

3) 28/5.246 = 5.34product can be formed (not that much sure)

4) 45/ 0.5185 = 86.79

86.79 - 5.34 = 81.45g

5) 50 / 81.45 x 100 = 61.39% ( i guess)

i hope this hleps you

Answer:

0.880 (0.88039867109 to be exact)

Explanation:

To convert from molecules to moles, simply divide by Avogadro's number which is 6.02 x 10^23

So, 5.30x10^23/6.02x10^23 = 0.880

total pressure=248+707+518=1473mmHg

partial pressure=total pressure×mole fraction

mole fraction of N2

=partial pressure of N2/total pressure

=707mmHg/1473mmHg

=0.4800